[PATCHv5 3/5] media: uvcvideo: add ROI auto controls

[Sergey Senozhatsky]

This patch adds support for Region of Interest bmAutoControls.

ROI control is a compound data type:
  Control Selector     CT_REGION_OF_INTEREST_CONTROL
  Mandatory Requests   SET_CUR, GET_CUR, GET_MIN, GET_MAX, GET_DEF
  wLength 10
  Offset   Field            Size
  0        wROI_Top         2
  2        wROI_Left        2
  4        wROI_Bottom      2
  6        wROI_Right       2
  8        bmAutoControls   2       (Bitmap)

uvc_control_mapping, however, can handle only s32 data type at the
moment: ->get() returns s32 value, ->set() accepts s32 value; while
v4l2_ctrl maximum/minimum/default_value can hold only s64 values.

Hence ROI control handling is split into two patches:
a) bmAutoControls is handled via uvc_control_mapping as V4L2_CTRL_TYPE_BITMASK
b) ROI rectangle (SET_CUR, GET_CUR, GET_DEF, etc.) handling is implemented
   separately, by the means of selection API.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
 drivers/media/usb/uvc/uvc_ctrl.c     | 19 +++++++++++++++++++
 drivers/media/v4l2-core/v4l2-ctrls.c |  1 +
 include/uapi/linux/usb/video.h       |  1 +
 include/uapi/linux/v4l2-controls.h   | 10 ++++++++++
 4 files changed, 31 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index b3dde98499f4..5502fe540519 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -355,6 +355,15 @@ static const struct uvc_control_info uvc_ctrls[] = {
 		.flags		= UVC_CTRL_FLAG_GET_CUR
 				| UVC_CTRL_FLAG_AUTO_UPDATE,
 	},
+	{
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= UVC_CT_REGION_OF_INTEREST_CONTROL,
+		.index		= 21,
+		.size		= 10,
+		.flags		= UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
+				| UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX
+				| UVC_CTRL_FLAG_GET_DEF
+	},
 };
 
 static const struct uvc_menu_info power_line_frequency_controls[] = {
@@ -753,6 +762,16 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 		.v4l2_type	= V4L2_CTRL_TYPE_BOOLEAN,
 		.data_type	= UVC_CTRL_DATA_TYPE_BOOLEAN,
 	},
+	{
+		.id		= V4L2_CID_REGION_OF_INTEREST_AUTO,
+		.name		= "Region of Interest (auto)",
+		.entity		= UVC_GUID_UVC_CAMERA,
+		.selector	= UVC_CT_REGION_OF_INTEREST_CONTROL,
+		.size		= 16,
+		.offset		= 64,
+		.v4l2_type	= V4L2_CTRL_TYPE_BITMASK,
+		.data_type	= UVC_CTRL_DATA_TYPE_BITMASK,
+	},
 };
 
 /* ------------------------------------------------------------------------
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 0d7fe1bd975a..8c5816f3f7d4 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -832,6 +832,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:	return "Min Number of Output Buffers";
 	case V4L2_CID_ALPHA_COMPONENT:		return "Alpha Component";
 	case V4L2_CID_COLORFX_CBCR:		return "Color Effects, CbCr";
+	case V4L2_CID_REGION_OF_INTEREST_AUTO:	return "Region Of Interest Auto Controls";
 
 	/* Codec controls */
 	/* The MPEG controls are applicable to all codec controls
diff --git a/include/uapi/linux/usb/video.h b/include/uapi/linux/usb/video.h
index bfdae12cdacf..9076a444758a 100644
--- a/include/uapi/linux/usb/video.h
+++ b/include/uapi/linux/usb/video.h
@@ -104,6 +104,7 @@
 #define UVC_CT_ROLL_ABSOLUTE_CONTROL			0x0f
 #define UVC_CT_ROLL_RELATIVE_CONTROL			0x10
 #define UVC_CT_PRIVACY_CONTROL				0x11
+#define UVC_CT_REGION_OF_INTEREST_CONTROL		0x14
 
 /* A.9.5. Processing Unit Control Selectors */
 #define UVC_PU_CONTROL_UNDEFINED			0x00
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index d43bec5f1afd..97f11b7a3a7c 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -993,6 +993,16 @@ enum v4l2_auto_focus_range {
 
 #define V4L2_CID_CAMERA_SENSOR_ROTATION		(V4L2_CID_CAMERA_CLASS_BASE+35)
 
+#define V4L2_CID_REGION_OF_INTEREST_AUTO	(V4L2_CID_CAMERA_CLASS_BASE+36)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_EXPOSURE		(1 << 0)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_IRIS			(1 << 1)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_WHITE_BALANCE		(1 << 2)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_FOCUS			(1 << 3)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_FACE_DETECT		(1 << 4)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_DETECT_AND_TRACK	(1 << 5)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_IMAGE_STABILIZATION	(1 << 6)
+#define V4L2_CID_REGION_OF_INTEREST_AUTO_HIGHER_QUALITY	(1 << 7)
+
 /* FM Modulator class control IDs */
 
 #define V4L2_CID_FM_TX_CLASS_BASE		(V4L2_CTRL_CLASS_FM_TX | 0x900)
-- 
2.31.1.527.g47e6f16901-goog